His tweet said: “There are times when I mourn the passing of the gas chamber...”

He was roundly condemned by other Twitter users. One, @reperioverum said: “thank goodness there is still a majority of decent people around to keep diseased human pustules of bacteria like you in check.”

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A spokesman for Ukip in Wales said: "These comments have nothing whatsoever to do with Ukip. The account is anonymous. It is likely this is an imposter, possibly a member of another party, trying to embarrass UKIP under the cloak of anonymity."

But North Wales’ Police and Crime Commissioner has challenged Ukip to condemn remarks apparently advocating sending anti-Donald Trump protestors to the gas chamber.

Commissioner Arfon Jones says the remarks made by a Waunfawr man, who goes by the Twitter handle @ukiparfon, bordered on “making an offensive and malicious communication”.

Mr Jones said: Mr Jones said: “Today we are remembering everyone who lost their lives in war.

“I don’t know whether this person is a member of UKIP and that’s why I have challenged Ukip to condemn him.

“I do think his remarks are bordering on making an offensive and malicious communication and if you go through previous tweets by @ukiparfon they are all pretty nasty.

“I haven’t made a formal complaint to the North Wales Police Cyber Crime Unit but I am sure they are aware of the situation.”

Ukip’s interim leader Nigel Farage spoke at a Trump rally during the campaign and yesterday joked that he was the “catalyst” for the billionaire’s win.

Trump’s charge to an unlikely victory was characterised by verbal assaults on minorities, women and disabled people.